An "outlier," in math and as as presented by Malcolm Gladwell, is A. A math concept to identify abnormal points on a graph.

B. A fictitious concept to explain norms on a graph.

C. People who live more than 20 miles outside city limits.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Re-do the question and enter the picture